Circuit Description
WARNING: This page is about a different car, the 2003 Lexus GS 430, 2003 Lexus GS 300, 2002 Lexus GS 430, and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
The horn is connected to the body ECU No. 1 and activated by the body ECU No. 1 during the warning of the anti-theft system.